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discriminated union discriminate out
export type Discriminate<
Prop extends keyof Union,
Discriminator extends Union[Prop],
> = Union extends { [T in Prop]: Extract<Union[Prop], Discriminator> } ? Union : never;
export type DiscriminateByType<
Union extends { type: any },
D extends Union['type']
> = Discriminate<Union, 'type', D>;
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